Camera Driven Rendering

[tychedelia]

Bevy's rendering APIs have been described as "camera driven" several times, but it's not always clear exactly what that means. In Bevy's rendering system, the "camera" entity has a privileged position and provides the following behaviors/data:

• A camera view matrix, i.e. the actual "camera" part of the camera, including the camera viewport
• The camera hdr-ness, which controls the texture format of the "internal" texture
• The render target, which describes where the final output will be composited
• The render graph entities visible within the camera should run
• Configuration for full-screen passes, including effects, anti-aliasing, etc.
• Implicitly, the rendering texture that is used for all passes of the render graph (ViewTarget)
• What entities are visible via RenderLayers